Biba and her handsome brother Rex live in a beautiful, rambling house in north London; naive Karen is soon lured into their dissolute circle, spending an idyllic summer whiling away the hours in a haze of booze and sex.

When Luke wakes up and finds a mutilated corpse in his bathroom, his life changes for ever. Stalked by a terrifying psychopathic serial killer, he has to place his trust in the hands of a smart but volatile female cop, Sam Cross.